Calibrating a continuous servo and external power warning

calibrate-servo.js

var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {
  /*
    Assuming a continuous servo is attached to pin 9, 
    this program can be called as:

    node calibrate-servo.js

    or

    node calibrate-servo.js [some PWM pin number] 

   */
  var servo = new five.Servo({
    pin: process.argv[2] || 9,
    type: "continuous"
  });

  servo.center();
  
  /*
    Centering a continuous servo should stop
    the horn from moving, ie. completely still. 

    If the horn is still moving while this program
    is running, use a small screw driver to adjust
    the trim pot until the horn is still. The trim
    pot will be exposed on the side of the servo
   */
});

video.md

Calibrate a continuous servo: video

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Always supply your servos with an external source! Failure to do so may result in USB port damage, Arduino damage or Servo damage. If your program crashes, this should be the first thing to check.

thanks sir, I now should get a continuous servo asap :)